Health benefits: As with other spring greens, kale is packed with a range of vitamins and minerals and rates especially high in vitamins A, C, B6 and K. Standout antioxidants (especially carotenoids and more than 45 different flavonoids) include beta-carotene, lutein, zeaxanthin, kaempferol, quercetin and glucosinolates, an anticancer nutrient.